2 files changed, 12 insertions, 0 deletions
diff --git a/game/geoData.cpp b/game/geoData.cpp
index 8e662b3..eef5dc7 100644
--- a/game/geoData.cpp
+++ b/game/geoData.cpp
@@ -601,3 +601,13 @@ GeoData::setHeights(const std::span<const GlobalPosition3D> triangleStrip, const
 
 	updateAllVertexNormals(newOrChangedVerts);
 }
+
+void
+GeoData::sanityCheck() const
+{
+	if (!std::ranges::all_of(faces(), [this](const auto face) {
+			return triangle<2>(face).isUp();
+		})) {
+		throw std::logic_error("Upside down faces detected");
+	}
+}
diff --git a/game/geoData.h b/game/geoData.h
index 79924d3..01582a6 100644
--- a/game/geoData.h
+++ b/game/geoData.h
@@ -98,6 +98,8 @@ public:
 		return property(surface, h);
 	}
 
+	void sanityCheck() const;
+
 protected:
 	template<glm::length_t Dim>
 	[[nodiscard]] Triangle<Dim>